Properties of Bituminous Binders Exposed to Ageing Process

3rd World Multidisciplinary Civil Engineering, Architecture, Urban Planning Symposium

土木建筑工程;文学

Remisova, Eva^1 ; Holy, Michal^1

University of ilina, Faculty of Civil Engineering, Univerzitna 8215/1, ilina

01026, Slovakia^1

关键词: Bitumen viscosity;    Bituminous binder;    Empirical properties;    Influence of oxygen;    Inorganic additives;    Polymer-modified bitumen;    Production technology;    Working temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/471/3/032030/pdf
DOI  :  10.1088/1757-899X/471/3/032030

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

During the production technology of asphalt mixture and road pavement construction, the bitumen binder is exposed to the influence of oxygen, and the oxidative aging of bitumen occurs. Changes of bitumen as a result of phenomena associated with evaporation and oxidation changes express in hardening. To improve the quality of bitumen and asphalt mixtures, an organic and inorganic additive are added. The paper reviews the change in the properties of paving grade and polymer modified bitumen by the effect of aging and the change of bitumen properties with the Licomont BS100 and Wetfix BE additives. Additive Wetfix BE, improving adhesion between bitumen and aggregate, had little influence on the empirical properties of tested bitumens. The Licomont BS100 additive caused an increase of the softening point and reduced the viscosity at higher temperatures of 120 to 180 °C, which allows reducing the working temperatures during the production, laying and compaction of the asphalt mixtures. The results confirmed the hardening of the binder after both short and longterm aging, which was reflected by a decrease in penetration and an increase in the softening point. The effect of aging by RTFOT generally showed an increase in bitumen viscosity without and with the additives. The greatest increase in viscosity was for bitumen PmB 45/80-75, the smallest change in values was for bitumen 50/70. Additives added to bitumen decreased the viscosity, except for Wetfix BE in bitumen 35/50. By comparing the bitumen viscosity results after aging without and with additives, the effects of additives on the bitumen viscosity are less prominent than those of bitumen without aging. Only with the Wetfix BE additive in bitumen 50/70, the viscosity change of the aged binder was greater than that of the unaged one.